http://www.zoho.com/

Zoho gives you online applications to create manage and edit your documents. A suite of online applications (services) that you sign up for and access from their Website.

The list of Productivity and Colaboration apps include.

WRITER, SHEET and SHOW which are your basic word, excel and powerpoint.
DOCS the online document manager.
NOTEBOOK for keeping notes.
WIKI.
PLANNER and MAIL.
CHAT
SHARE the centralised online public repository.